Load Data Error 401: Unauthorised - JSON Store

Our web server security is based on Revert to Self and each time a browser attempts to load ajax data (classic asp) it initially fails with a 401 Error, an automatic retry results in another 401 Error but on the third automatic attempt the page is loaded.

I would like to make use of the excellent Load Data feature in Architect but it appears that the system gives up it it receives a 401 Error at the first attempt.